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The 40 pages that link to Orbital period, each with the reason it gives.

• Kepler's laws of planetary motionRelated: It is the time quantity related to orbital size by the third law.

• ExoplanetRelated: Its measured period helps characterize an exoplanet’s orbit and distance from its star.

• Orbital eccentricityCompared with: Period measures orbital timing, not the conic's departure from a circle.

• Transit methodRelated: Repeated transits reveal the interval between passages and thus the planet’s orbital period.

• Geostationary orbitRelated: The orbit’s period matches Earth’s rotation relative to the stars.

• Low Earth orbitRelated: Low-altitude orbits typically circle Earth in roughly 90 minutes.

• Hot JupiterRelated: A short orbital period is a practical clue to a hot Jupiter’s close orbit.

• Retrograde motionRelated: Different orbital periods make Earth periodically overtake outer planets and be overtaken by inner ones.

• Hohmann transfer orbitRelated: The transfer coast lasts half the transfer ellipse's orbital period.

• Semimajor axisRelated: For a bound two-body orbit, period depends on the semimajor axis and total mass.

• Satellite constellationRelated: Period governs how quickly satellites revisit locations and move between coverage regions.

• Mean-motion resonanceRelated: Resonance is defined by ratios between the bodies’ orbital periods.

• Kirkwood gapRelated: Period ratios with Jupiter identify the resonances associated with gaps.

• OrbitBroader topic: It connects orbital size to the time required for one full circuit.

• Roche-lobe overflowRelated: Mass exchange and angular-momentum loss can change the binary’s period.

• Synchronous rotationRelated: Synchronous rotation is defined by equality with this period.

• Transit timing variationRelated: A planet’s predicted transit schedule is based on its orbital period.

• 51 Pegasi bRelated: Its 4.2-day period was the key signal in the original detection.

• Circular orbitRelated: For a circular orbit, its value follows from radius and the central body's mass.

• Kepler's third lawBroader topic: Its square is the quantity related to the cube of orbital size.

• Sidereal yearNarrower topic: A sidereal year is Earth’s orbital period measured against distant stars.

• Planetary orbitBroader topic: It is the recurring timescale set by orbital size and the star’s mass.

• Sidereal monthNarrower topic: The four lunar months all measure the same orbit against different reference directions.

• Draconic monthNarrower topic: A draconic month is an orbital period measured relative to a node.

• Medium Earth orbitRelated: MEO altitude determines how long a satellite takes to circle Earth.

• Space rendezvousRelated: A small difference in orbital period changes how quickly two spacecraft gain or lose orbital position.

• Didier QuelozRelated: The 4.2-day repeating signal helped identify 51 Pegasi b as a close-orbiting planet.

• Kepler-186fRelated: Kepler-186f completes an orbit around its star in about 130 days.

• Kepler's equationRelated: The period determines how quickly mean anomaly advances with time.

• Orbital spaceflightRelated: Altitude and orbital shape determine how long a spacecraft takes to circle its destination.

• Molniya orbitRelated: The roughly 12-hour period sets the orbit’s repeating coverage rhythm.

• Cataclysmic variable starRelated: The binary’s orbit sets the timescale for eclipses, mass transfer, and long-term evolution.

• Period (time interval)Broader topic: It measures the time required for a gravitational orbit to repeat.

• Geosynchronous orbitRelated: Matching this period to Earth’s sidereal rotation defines a geosynchronous orbit.

• Kepler-22bRelated: The spacing between Kepler-22b’s transits reveals its roughly 290-day orbit.

• 55 Cancri eRelated: 55 Cancri e completes an orbit in about 17.7 hours.

• Astronomical system of unitsRelated: Periods expressed in days pair naturally with distances and masses in the historical system.

• Dermott's lawNarrower topic: Dermott's law compares the orbital periods of neighboring satellites.

• Gliese 581dRelated: A recurring velocity signal was assigned an orbital period for Gliese 581d.

• HD 189733 bRelated: Its roughly 2.2-day period reflects the planet’s close orbit around HD 189733.